Answer Posted / a.ramaprasad

MCB - MINIATURE CIRCUIT BREAKER
MCCB - MODULE CASE CIRCUIT BREAKER
MCB RATING : 63 AMP (MAXIMUM) i.e. in the form of tpn(
THREE PHASE + NUETRAL)
MCCB _ 63AMP (min.)
MCB IS USED WHERE LOAD IS LOW BUT MCCB IS USED WHERE LOAD
IS HIGH AND USE AS INCOMER.WHILE THE MCB IS USED FOR
OUTGOING.

Addition to the above answers :
Now a days MCB' are avialble till 125 Amps too.

Many of distribution board use MCB as as both incomer and
out going. Normally recommended for three phase input and
single phaseout put , though it is used for 3 phaseinput &
out put.

Another important factor in MCB is it's breaking capacity
is limited up to 16 kA only though earlier it was limted
up to 9 and 10 kA only.

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